Management of Complex Diverticular Disease With Fistulation Into an Ovarian Dermoid Cyst.

Diverticular disease is prevalent amongst the adult Australian population. Diverticular disease can be complicated by fistula formation, most commonly involving the bladder or bowel. We report a rare case of an immunocompromised 69-year-old woman with a diverticular fistula extending into a complex right ovarian dermoid cyst. The patient presented to and was surgically managed in a rural Western Australian hospital with an emergency laparotomy, en bloc resection, and Hartmann's procedure. The patient recovered well and is awaiting elective colostomy reversal. This case demonstrates a rare complication of diverticular disease leading to a delayed presentation and demonstrates that timely surgical intervention can enable optimal outcomes despite geographic isolation.